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Hello, I would like to play the game but could not figure out how to execute the file in debian system

Hi, did you download the Linux files instead of the Windows files?

exactly, debian is a linux distribution

(+1)

I asked around for you and this is what I was told: 

Mark file as executable (right click, permissions, mark as executable or chmod +x filename in terminal). And either double click the file or run ./filename.x86 from the terminal.

I can't check if it works, because I don't have Debian, so you'll have to try yourself.